Shut-off valve



FIG. 1 is a left front perspective view of a shut-off valve showing my new design, a right front perspective view being a mirror image;

FIG. 2 is a left side elevational view, the right side being a mirror image;

FIG. 3 is a front elevational view;

FIG. 4 is a rear elevational view; and,

FIG. 5 is a top plan view thereof. 

The ornamental design for a shut-off valve, as shown and described. 